diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7b453d9e..91cd6501 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -15,7 +15,7 @@ jobs:
       uses: actions/checkout@v3
 
     - name: Set Up Cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: |
           vendor
@@ -35,12 +35,25 @@ jobs:
     - name: Format
       run: ./vendor/bin/php-cs-fixer fix && git diff --exit-code
 
+  static:
+    name: Static Analysis
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 2
+    - name: PHPStan
+      uses: php-actions/phpstan@v3
+      with:
+        contfiguration: tests/phpstan.neon
+
   test:
     name: PHP ${{ matrix.php }} / DB ${{ matrix.database }}
     strategy:
       fail-fast: false
       matrix:
-        php: ['8.1']
+        php: ['8.1', '8.2']
         database: ['pgsql', 'mysql', 'sqlite']
 
     runs-on: ubuntu-latest
@@ -51,7 +64,7 @@ jobs:
         fetch-depth: 2
 
     - name: Set Up Cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: |
           vendor
diff --git a/composer.json b/composer.json
index 710b9cc2..5caa462b 100644
--- a/composer.json
+++ b/composer.json
@@ -58,7 +58,8 @@
 	"require-dev" : {
 		"phpunit/phpunit" : "^9.0",
 		"friendsofphp/php-cs-fixer" : "^3.12",
-		"scrutinizer/ocular": "dev-master"
+		"scrutinizer/ocular": "dev-master",
+		"phpstan/phpstan": "1.10.x-dev"
 	},
 	"suggest": {
 		"ext-memcache": "memcache caching",
diff --git a/composer.lock b/composer.lock
index cb4a0aed..945585c1 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "e7d482b23052d4e764a4f2c076865bc5",
+    "content-hash": "d010608b1d82774bd3444615496f254f",
     "packages": [
         {
             "name": "bower-asset/jquery",
@@ -2264,6 +2264,66 @@
             },
             "time": "2023-01-29T14:41:23+00:00"
         },
+        {
+            "name": "phpstan/phpstan",
+            "version": "1.10.x-dev",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpstan/phpstan.git",
+                "reference": "f9f7d4a0714c8356ebe3a14e328a0a6dc778d454"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/f9f7d4a0714c8356ebe3a14e328a0a6dc778d454",
+                "reference": "f9f7d4a0714c8356ebe3a14e328a0a6dc778d454",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2|^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan-shim": "*"
+            },
+            "default-branch": true,
+            "bin": [
+                "phpstan",
+                "phpstan.phar"
+            ],
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "PHPStan - PHP Static Analysis Tool",
+            "keywords": [
+                "dev",
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/phpstan/phpstan/issues",
+                "source": "https://github.com/phpstan/phpstan/tree/1.10.x"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/ondrejmirtes",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/phpstan",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpstan/phpstan",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-02-02T16:02:59+00:00"
+        },
         {
             "name": "phpunit/php-code-coverage",
             "version": "9.2.x-dev",
@@ -5483,7 +5543,8 @@
     "stability-flags": {
         "shish/gqla": 20,
         "naroga/redis-cache": 20,
-        "scrutinizer/ocular": 20
+        "scrutinizer/ocular": 20,
+        "phpstan/phpstan": 20
     },
     "prefer-stable": false,
     "prefer-lowest": false,
diff --git a/core/cacheengine.php b/core/cacheengine.php
index 60f4cac4..d8c02d75 100644
--- a/core/cacheengine.php
+++ b/core/cacheengine.php
@@ -70,7 +70,7 @@ class EventTracingCache implements CacheInterface
     public function getMultiple($keys, $default = null)
     {
         $this->tracer->begin("Cache Get Multiple");
-        $val = $this->engine->getMultiple($values, $default);
+        $val = $this->engine->getMultiple($keys, $default);
         $this->tracer->end();
         return $val;
     }
@@ -109,7 +109,7 @@ function loadCache(?string $dsn): CacheInterface
             $hp = explode(":", $matches[2]);
             $memcache = new \Memcached();
             $memcache->addServer($hp[0], (int)$hp[1]);
-            $c = new \Sabre\Cache\Memcached($memcached);
+            $c = new \Sabre\Cache\Memcached($memcache);
         } elseif ($matches[1] == "apc") {
             $c = new \Sabre\Cache\Apcu();
         } elseif ($matches[1] == "redis") {
diff --git a/core/config.php b/core/config.php
index 12857435..3372bf17 100644
--- a/core/config.php
+++ b/core/config.php
@@ -264,6 +264,7 @@ class DatabaseConfig extends BaseConfig
     private string $table_name;
     private ?string $sub_column;
     private ?string $sub_value;
+    private string $cache_name;
 
     public function __construct(
         Database $database,
diff --git a/core/extension.php b/core/extension.php
index cf41957b..88667049 100644
--- a/core/extension.php
+++ b/core/extension.php
@@ -233,7 +233,7 @@ abstract class ExtensionInfo
             return self::$all_info_by_class[$normal];
         } else {
             $infos = print_r(array_keys(self::$all_info_by_class), true);
-            throw new ScoreException("$normal not found in {$infos}");
+            throw new SCoreException("$normal not found in {$infos}");
         }
     }
 
@@ -242,7 +242,7 @@ abstract class ExtensionInfo
         foreach (get_subclasses_of("Shimmie2\ExtensionInfo") as $class) {
             $extension_info = new $class();
             if (array_key_exists($extension_info->key, self::$all_info_by_key)) {
-                throw new ScoreException("Extension Info $class with key $extension_info->key has already been loaded");
+                throw new SCoreException("Extension Info $class with key $extension_info->key has already been loaded");
             }
 
             self::$all_info_by_key[$extension_info->key] = $extension_info;
diff --git a/core/imageboard/tag.php b/core/imageboard/tag.php
index 0ce5464e..1a00c20d 100644
--- a/core/imageboard/tag.php
+++ b/core/imageboard/tag.php
@@ -174,7 +174,7 @@ class Tag
         }  // hard-code one bad case...
 
         if (mb_strlen($tag, 'UTF-8') > 255) {
-            throw new ScoreException("The tag below is longer than 255 characters, please use a shorter tag.\n$tag\n");
+            throw new SCoreException("The tag below is longer than 255 characters, please use a shorter tag.\n$tag\n");
         }
         return $tag;
     }
diff --git a/core/sanitize_php.php b/core/sanitize_php.php
index 598d412b..a47cc394 100644
--- a/core/sanitize_php.php
+++ b/core/sanitize_php.php
@@ -9,9 +9,6 @@ namespace Shimmie2;
  * be included right at the very start of index.php and tests/bootstrap.php
  */
 
-use JetBrains\PhpStorm\NoReturn;
-
-#[NoReturn]
 function die_nicely($title, $body, $code=0)
 {
     print("<!DOCTYPE html>
diff --git a/core/user.php b/core/user.php
index 11546a8e..afb80bbb 100644
--- a/core/user.php
+++ b/core/user.php
@@ -177,7 +177,7 @@ class User
     {
         global $database;
         if (User::by_name($name)) {
-            throw new ScoreException("Desired username is already in use");
+            throw new SCoreException("Desired username is already in use");
         }
         $old_name = $this->name;
         $this->name = $name;
diff --git a/ext/comment/main.php b/ext/comment/main.php
index 61e86b22..8e254877 100644
--- a/ext/comment/main.php
+++ b/ext/comment/main.php
@@ -573,6 +573,7 @@ class CommentList extends Extension
                 'user_agent'   => $_SERVER['HTTP_USER_AGENT'] ?? 'none',
             ];
 
+            // @phpstan-ignore-next-line
             $akismet = new \Akismet(
                 $_SERVER['SERVER_NAME'],
                 $config->get_string('comment_wordpress_key'),
diff --git a/ext/index/theme.php b/ext/index/theme.php
index a0dd4d05..b9984bf8 100644
--- a/ext/index/theme.php
+++ b/ext/index/theme.php
@@ -128,9 +128,9 @@ and of course start organising your images :-)
                 }
                 $wikiLink = make_link("wiki/$st");
                 if (class_exists('Shimmie2\TagCategories')) {
-                    $this->tagcategories = new TagCategories();
-                    $tag_category_dict = $this->tagcategories->getKeyedDict();
-                    $st = $this->tagcategories->getTagHtml(html_escape($st), $tag_category_dict);
+                    $tagcategories = new TagCategories();
+                    $tag_category_dict = $tagcategories->getKeyedDict();
+                    $st = $tagcategories->getTagHtml(html_escape($st), $tag_category_dict);
                 }
                 $short_wiki_description = '<h2>'.$st.'&nbsp;<a href="'.$wikiLink.'"><sup>ⓘ</sup></a></h2>'.$short_wiki_description;
                 $page->add_block(new Block(null, $short_wiki_description, "main", 0, "short-wiki-description"));
diff --git a/ext/tag_list/main.php b/ext/tag_list/main.php
index 345cf9c4..021fe730 100644
--- a/ext/tag_list/main.php
+++ b/ext/tag_list/main.php
@@ -11,6 +11,8 @@ class TagList extends Extension
     /** @var TagListTheme */
     protected ?Themelet $theme;
 
+    private $tagcategories = null;
+
     public function onInitExt(InitExtEvent $event)
     {
         global $config;
diff --git a/ext/tag_list/theme.php b/ext/tag_list/theme.php
index f829465a..c274a743 100644
--- a/ext/tag_list/theme.php
+++ b/ext/tag_list/theme.php
@@ -9,6 +9,7 @@ class TagListTheme extends Themelet
     public string $heading = "";
     public string $list = "";
     public ?string $navigation;
+    private $tagcategories = null;
 
     public function set_heading(string $text)
     {
diff --git a/ext/wiki/theme.php b/ext/wiki/theme.php
index db29f0b8..c1d4ccce 100644
--- a/ext/wiki/theme.php
+++ b/ext/wiki/theme.php
@@ -32,9 +32,9 @@ class WikiTheme extends Themelet
         // see if title is a category'd tag
         $title_html = html_escape($wiki_page->title);
         if (class_exists('Shimmie2\TagCategories')) {
-            $this->tagcategories = new TagCategories();
-            $tag_category_dict = $this->tagcategories->getKeyedDict();
-            $title_html = $this->tagcategories->getTagHtml($title_html, $tag_category_dict);
+            $tagcategories = new TagCategories();
+            $tag_category_dict = $tagcategories->getKeyedDict();
+            $title_html = $tagcategories->getTagHtml($title_html, $tag_category_dict);
         }
 
         if (!$wiki_page->exists) {
diff --git a/tests/phpstan.neon b/tests/phpstan.neon
new file mode 100644
index 00000000..3c43eedb
--- /dev/null
+++ b/tests/phpstan.neon
@@ -0,0 +1,9 @@
+parameters:
+  level: 0
+  paths:
+    - ../core
+    - ../ext
+    - ../tests
+    - ../themes/default
+  ignoreErrors:
+    - '#Attribute class GQLA\\Expose#'
\ No newline at end of file
diff --git a/themes/material/home.theme.php b/themes/material/home.theme.php
index fb909563..55522fca 100644
--- a/themes/material/home.theme.php
+++ b/themes/material/home.theme.php
@@ -37,7 +37,7 @@ EOD
         $message_html = empty($main_text) ? "" : "<div class='space' id='message'>$main_text</div>";
         $counter_html = empty($counter_text) ? "" : "<div class='mdl-typography--text-center' id='counter'>$counter_text</div>";
         $contact_link = empty($contact_link) ? "" : "<br><a href='mailto:$contact_link'>Contact</a> -";
-        $main_links_html = empty($main_links) ? "" : preg_replace('data-clink-sel="" ', '', preg_replace('/shm-clink/', 'mdl-navigation__link', $main_links));
+        $main_links_html = empty($main_links) ? "" : preg_replace('/data-clink-sel="" /', '', preg_replace('/shm-clink/', 'mdl-navigation__link', $main_links));
         $search_html = "
 			<div class='mdl-grid'>
 				<div class='mdl-layout-spacer'></div>